The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2015
Filed:
Jul. 22, 2011
Tadashi Nemoto, Osaka, JP;
Naru Usukura, Osaka, JP;
Akizumi Fujioka, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A photosensor-equipped display device is provided having a combination of visible and non-visible light sources where a voltage drop is minimized when the non-visible light source is turned on. The display device includes: an active matrix substrate; photosensors () provided in a pixel region () of the active matrix substrate; white LEDs () configured to cause an image to be displayed in the pixel region (); infrared LEDs () configured to emit light to be reflected and sensed by the photosensors; and a light source control circuit () configured to control on and off of the white LEDs () and the infrared LEDs (). The light source control circuit () reduces an amount of drive current supplied to the white LEDs () while the infrared LEDs () are on to below an amount of drive current supplied to the white LEDs () when the infrared LEDs () are off.